Okay, I get the feeling you don't really get the difference. There's two parts to it.

If you're trying to say that cars are dangerous, well yeah no shit. They're big objects that move fast. There are a lot of things that can fit in that category, from beasts of labor to overhead light fixtures. So maybe try to narrow down why somethings are more dangerous than others.

Leading into that, the reason guns are considered more dangerous than most things we take for granted is because, and I hope this isn't a surprise to you, but are literally designed to destroy something in the easiest man-portable way possible. Compared to a car, you can use a car for a lot of things. You can go get groceries with a car. Hell, in some ways not having a form of motor transportation can leave you disadvantaged in today's world. We just accept that there is inherent risk, but even then we still work in licenses, registration, and other regulations and it's not like irresponsibility isn't punished here either. And on top of that, if we want to stay on topic with respect to the above article, if your car gets lost/stolen, while it may be used to facilitate a crime, it probably won't be the tool of a murder. If your gun gets stolen... I do not see many other ways that could play out.

They're not the same. Guns require a much greater level of responsibility and competency. Especially as a tool that the vast majority of people do not need and will never use.

Yeah, but cars and boats aren't literally designed to kill someone. They have a use other than ending a life, so I hope you can understand why it's not the same.

Responsible gun owners^TM